Choke and regulating means



Dec. 7, 1954 D. A. ARMSTRONG ETAL 2,696,221

CHOKE AND REGULATING MEANS Filed Sept. 25, 1949 2 Sheet s-Sheet 1 FILE .1.

.DflN/EL A. flfiwsrkam NERTON F SNYDER 1954 D. A. ARMSTRONG EI'AL 2,696,221

CHOKE AND REGULATING MEANS Filed Sept. 23, 1949 2 Sheets-Sheet 2 l4q HE E ,4

4 I5 I04 I06 2/ 20 DAN/EL fl. AFMsrRo/m Mfr? TON F 5/0 1715 ITTOFME Y United States Patent CHOKE AND REGULATING MEANS Daniel A. Armstrong and Merton F. Snyder, Minneapolis, Minn, assignors t0 Scott-Atwater Manufacturing Co. Inc, Minneapolis, Minn, a corporation of Minnesota.

Application September 23, 1949-, Serial No. 117,364

9 Claims. (Cl. 137636.4)

This invention relates to a carburetor, such as used with an internal combustion engine and particularly to such a carburetor commonly used with an outboard motor.

It has been the common practice heretofore to have a carburetor with an air inlet passage, a valve in said passage for opening and closing the same normally and resiliently held in open position, a manually operable member for moving the valve to closed position, a second small passage for fuel, a second valve for controlling said second passage, together with a second and separate manually operable member for operating said second valve to regulate the amount of fuel fed to the motor.

It is a further object of the invention to provide a carburetor having an air inlet passage, a valve in said passage preferably of plate-like form for opening and closing said passage, which valve is normally held in open position, a second small passage for fuel, a second valve movable longitudinally for controlling said second passage, together with a manually operable member having rectilinear movement for operating said first mentioned valve and having rotative movement for operating said second valve.

It is more specifically an obiect of the invention to provide a carburetor having an air inlet passage preferaby of cylindrical form in cross section, a circular plate-like valve disposed in said passage, resilient means holding said valve in open position, a second small passage for fuel, a second valve cooperating with said second passage and having means for moving it longitudinally upon rotation thereof, a crank secured to said first mentioned valve, a lever connected at one end of said crank for operating the same, a member'secured to said second valve preferably having a cylindrical periphery, a second member fitting over said first mentioned member and preferably in the form of a cylindrical shell, means connecting said first mentioned member and second member permitting rectilinear movement of said second member, said second member being disposed to engage said lever whereby said second member can be moved rectilinearly to operate said first mentioned valve and it can. be rotated to operate said second valve.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:

Fig. 1 is a view in side elevation of a carburetor, a small portion of the motor being shown;

Fig. 2 is a view in side elevation of the carburetor, some parts being shown in vertical section taken substantially on line 44 of Fig. 3, as indicated by the arrows;

Fig. 3 is a view in front elevation of the carburetor;

Fig. 4 is a view partly in side elevation and partly in vertical section taken on line 44 of Fig. 3;

Fig. 5 is a vertical section taken on line 55 of Fig. 4, as indicated by the arrows; and

Fig. 6 is a partial View in front elevation with a valve shown in different position from that shown in Fig. 3.

Referring to the drawings, a carburetor 10 is shown, in Fig. 1 as attached to the intake portion 11 of the motor. The portion 12 of a hood which surrounds the carburetor and other parts is also shown in Fig. 1. A shaft 13 is shown which is mounted in a lug 10a of the carburetor casing. A lever 14 having adjustable parts U-shaped yoke or bight 33c.

2,696,22 l atented Dec r' ice tion 14c. vA pin- 15 connected to an arm 16 extending radially from a shaft 17 cooperates with lever portion 140.. Shaft 17 is secured to a valve regulating the fuel mixture not shown. An adjusting rod 18 is mounted in'the upper portion of the carburetor and held in the position shown by a compression coiled spring surround-.- ing the same and bearing at one end against the carburetor casing and at the other end against a plate 20, which plates engages a pin 21 secured in rod 18. The above described parts are common parts of a carburetorand. form no part of the present invention. Further description of the same is deemed unnecessary.

The carburetor casing is provided with a passage 10b which constitutes the air intake passage, the same being open at the front of the carburetor. A shaft 24 is journaled in the carburetor casing and extends across passage 10b, the same being flattened within said passage to form a portion 24a having one side lying substantially in a diameter of said shaft. A valve 25 of plate-like form and substantially circular in plan is secured to portion 24a by a screw 26. Shaft 24 has a projecting portion 24b at one side of the carburetor casing and a coiled torsion spring 27 surrounds said. portion 24b, the same being secured at one end to a small headed pin 28 secured in the carburetor casing and the other end thereof being secured in a slot 24c in the end of portion 24b. Spring 27 is under tension to swing valve 25 to open position, as shown in Figs. 3 and 4, the same being held in such position by engaging a stop pin 30 which depends from the top of passage 10b. Shaft 24 has secured thereto at its end opposite spring 27 a radially extending arm 31. A lever 33 formed of a small rod or wire has one end portion 33a extending through the head of a screw 34 secured in the carburetor casing, the end of portion 33a having thereon a washer 35 held in place by a locking pin or key 36. Lever 33 is bent to extend at a right angle adjacent screw 34 and has an intermediate portion 33b in which is formed a downwardly extending substantially Portion 33b is again bent successively at right angles to form a crank portion 33d which extends through the arm 31. Portion 33a is oscillatable in screw 34- so that lever 33 can be swung about the axis of portion 33a. The downwardly extending portion 330 is disposed in line with a flange 38a projecting outwardly from the open end of a cylindrical shell 38 having an outer closed end. As shown in Fig. 3', the outer side of said closed end carries the legend Carb. Control and is provided with circumferential graduations numbered from 0 to 9. Shell 38 fits on and is longitudinally slidable on a cylindrical member 39 disposed within shell 38. Member 39 has I I a plurality of passages 39a extending longitudinally therethrough. A compression coiled spring 43 of frustoconical form has one end engaging the closed end of shell 38 and its other end engaging member 39 which has a slightly projecting peripheral flange surrounding the end of spring 40. The central portion of member 39 is bored to receive a rod or stem 42 which is threaded into a plug 43 which is in turn threaded to be screwed and secured into the casing 10a of the carburetor. Plug 43 has an outer threaded portion threaded to receive a packing gland 44. A valve stem 42a extends inwardly from stem 42, the same having a pointed end which cooperates with a valve seat 45 surrounding the outer end of a small fuel passage 46 which extends into a larger passage 47. Passage 47 is formed in a depending portion 10c of the carburetor about which is disposed the usual float 48 disposed in the fuel chamber. Stem 42 is secured in member 39 by a set screw 50 which extends radially in member 39 and has its head 50a disposed in an elongated oblong slot 38b in shell 38. A pin 51 is secured in member 39 which is arranged and disposed to engage a stop (not shown) on carburetor casing 10a to limit rotation of shell 38 to substantially 360 degrees.

As stated, passage 10b forms the air inlet passage for" the carburetor. The valve 25 is normally held in open position, as shown in Figs. 3 and 4, by spring 27 which holds the same against the stop 30. It is often desired to choke the engine upon starting and this is done by temporarily closing valve 25. This can be done by pushing upon the outer end of shell 38. Shell 38 is held in normal position with the inner end of slot 38b engaging screw head 50a, as shown in Fig. 1. When shell 38 is pushed inwardly, flange 38a engages the depending yoke or bight portion 33c of lever 33 and said lever is swung about the axis of portion 33a so that its outer end 33:! swings arm 31 and thus oscillates shaft 24 to move valve 25 to the closed position shown in Figs. 2 and 6. Usually shell 38 is pushed in several times by the operator in the choking operation. As stated, shell 38 moves inwardly rectilinearly, the same being guided by head 50a. It is also necessary and the common practice to adjust the fuel supply to the engine. This can easily be done by turning or rotating the shell 38. Such rotation rotates stem 42 and valve stem 42a is thus moved toward and from its seat by the threaded portion of stem 42 moving in plug 43 which forms a nut. One member, namely the shell 38 thus functions both to choke the engine and to adjust the fuel. Formerly two separate members sirni lar to the shell 38 were used, one being used for the choking operation and the other for adjusting the supply of fuel. With the present construction one member serves both functions. This constitutes quite an advance in the art. The device is simple in construction and functions with certainty. The structure has been amply demonstrated in actual practice, found to be very successful and efiicient and is being commercially made.

It will of course be understood that various changes may be made in the form, details, arrangement and pro portions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A carburetor having in combination, a casing, an inlet passage for air in said casing, a plate valve oscillatable in said passage for opening and closing the same, a spring acting to hold said valve in open position, a member journaled in said casing to which said valve is secured, an arm secured to said member and extending radially thereof, a lever, connected to said arm, a manually operable member having rectilinear movement disposed adjacent said lever and movable in one direction to engage said lever for operating said lever to oscillate said valve against the pressure of said spring and movable in the opposite direction to move away from said lever, and resilient means for holding said manually operable member in normal position away from said lever.

2. A carburetor having in combination, a casing, an inlet passage for air, a valve for opening and closing said passage, a spring for moving said valve to open position, a lever for moving said valve to closed position, a small second passage for fuel, a second valve cooperating with said second passage for regulating the passage of fuel, means for moving said second valve longitudinally upon rotation thereof, a member secured to said second valve, a second member fitting over and slidable on said member in a direction longitudinally of said second valve, means connecting said first mentioned and second members, said second member being slidable longitudinally of said first mentioned member for engaging said lever and swinging said first mentioned valve and being rotatable with said first mentioned member for operating said second valve.

3. The structure set forth in claim 2, said first mentioned member having a cylindrical periphery and said second member constituting a cylindrical shell fitting on said periphery, said shell having a slot therethrough extending longitudinally thereof, and a set screw disposed in said slot and threaded into said first mentioned member and engaging said second valve.

4. The structure set forth in claim 2, and a spring disposed between said first mentioned and second members for holding said second member in normal position away from said lever.

5. A carburetor having in combination, a passage for fluid, a valve extending across said passage and swingable to close or open said passage, a spring acting to hold said valve in open position, a member connected to said valve for swinging the same, a lever having one end connected to said member to move the same and swing said valve against the pressure of said spring, said lever being fulcrumed at its other end and a member mounted for rectilinear movement in one direction to engage and swing said lever to swing said valve, and movable in the opposite direction away from said lever to permit said spring to open said valve.

6, The structure set forth in claim 5, a second passage for fuel, a second valve movable longitudinally by rotation thereof for controlling said second passage, said last mentioned member being connected to said second valve and being rotatable for operating said second valve.

7. The structure set forth in claim 5, a second passage for fuel, a second valve movable longitudinally by rotation thereof for controlling said second passage, a second member having a cylindrical periphery secured to said valve for rotating the same, said last mentioned member being in the form of a cylindrical shell, said last mentioned member and said second member having engaging surfaces, one of which is rectilinear, said last mentioned member being secured to said second member to rotate therewith but being longitudinally slidable thereon with said rectilinear movement for engaging said lever.

8. The structure set forth in claim 7, and a compression coiled spring between said second member and said last mentioned member for holding the latter away from said lever.

9. A device for operating a swinging valve having an operating lever connected thereto and also for operating a second valve movable longitudinally by rotation thereof comprising a member having a cylindrical periphery secured to said second valve for rotating the same, a shell-like member mounted on said member, a second member secured to said first mentioned member, said shell-like member having a slot extending longitudinally thereof in which said second member is disposed so that said shell-like member will rotate said first mentioned member but is longitudinally slidable thereon and adapted to be moved into engagement with said lever for operating said first mentioned valve and resilient means holding said shell-like member in position removed from said lever.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,196,976 Pembroke Sept. 5, 1916 1,395,767 Possinger et a1. Nov. 1, 1921 1,400,110 Warner Dec. 13, 1921 1,464,601 Fairchild Aug. 14, 1923 1,556,179 Titman Oct. 6, 1925 1,802,913 Ford Apr. 28, 1931 2,589,573 Ray Mar. 18, 1952 

